Example
The $Label variable can be used to display text defined in your custom labels.
<apex:outputText value="{!$Label.Welcome_Message}" />
You can do formatting with labels as well. Suppose you have a custom label named Welcome_Message defined as
Welcome to our site, {0}!
You could use the label to display a formatted message:
<apex:outputText value="{!$Label.Welcome_Message}" rendered="{!NOT(ISBLANK($User.ContactId))}">
<apex:param value="{!$User.Contact.FirstName}" />
</apex:outputText>
